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UNITED STATES PATENT OFFICE.

ERNST KONIG, OF HGCHST-ON-THE-MAIN, GERMANY, ASSIGNOR TO THE FARE-WERKE, VORMALS MEISTER, LUCIUS 85 BRUNING, OF SAME PLACE,

BASIC YELLOW DISAZO DYE.

SPECIFICATION forming part of Letters Patent No. 602,638, dated. April19, 1898.

Application filed May 6, 1897. Serial No. 635,397. (Specimens) To allwhom it may concern.-

Be it known that I, ERNST KGNIG, doctor of philosophy, a citizen of theEmpire of Germany, residing at Hochst-on-the-Main, Germany, haveinvented certain new and useful Improvements in the Manufacture of aYellow Dyestuff, of which the followingis a specificationl Thisinvention relates to a yellow basic disazo dyestuff obtained by theaction of diazotized meta-trimethyl ammonium phenyl-a20- meta-toluidinupon 1 phenyl, 3 methyl, 5 pyrazolon.

The reaction is set out in the following equation:

a: in this equation means chlorin or an equivalent radical of an acid.

The process is, for instance, as follows: 47 .7 kilos of the zincchlorid double salt of meta-trimethyl ammonium phenyl-azo-metatoluidinhydrochlorid are dissolved in about one thousand liters of waterand'diazotized at to centigrade by the addition of twenty kilos ofhydrochloric acid of Baum and 6.9 kilos of acetate of sodium. This diazosolution is then run into an aqueous solution of 17.4 kilos of 1 phenyl,3 methyl, 5 pyrazolon, and ten kilos of calcined soda. A stickygelatinous yellow paste results. When heated, the mass becomes liquid bythe addition of acetic acid. The dyestufE is precipitated with commonsalt from the hot filtered solution. I

The dyestufi thus obtained exhibits the following properties: It formsan orange-yellow powder easily soluble in water with a yellow color.This solution turns yellow red on addition of soda. Soda-lye changes itto cherry red. Hydrochloric acid does not change its color, butprecipitates the dyestufit. It is soluble in alcohol, ether, andbenzene, insoluble in petroleum ether, and soluble in concentratedsulfuric acid with a carmin-red color.

The new dyestuff dyes tanned and untanned cottipn, as well as half-wool,evenly in an acidbat Having thus described my invention, I claim as newand desire to secure by Letters Patent As a new product, the yellowdyestuff obtained from diazotized meta-trimethyl ammoniumphenyl-azo-meta-toluidin and l phenyl 3 methyl 5 pyrazolon, being anorange-yellow powder, soluble in water, alcohol, ether and benzene;insoluble in petroleum ether, dyeing tanned and untanued cotton as wellas half-wool yellow in an acid-bath, substan tially as set forth.

In testimony that I claim the foregoing as my invention 1 have signed myname in presence of two subscribing witnesses.

ERNST KONIG.

Witnesses:

HEINRICH HAHN, ALFRED BRISBIN.

